U.S. President Donald Trump defended his daughter, White House adviser Ivanka Trump, on Monday after she raised some eyebrows over the weekend by taking his place at a table with world leaders at a G20 meeting.

She briefly sat in her father’s chair at the global gathering in Hamburg during a closed-door session on African development as the World Bank president spoke.

Her appearance prompted a string of reactions on Twitter and caught the attention of the German media and other outlets.

Early on Monday, Trump called the arrangement “very standard” in a tweet where he also noted that German Chancellor Angela Merkel, who was hosting the G20 summit, agreed.

Merkel had dismissed the move at a news conference after the G20 ended.

“Ivanka belongs to the U.S. delegation,” Merkel, who has worked with her on various issues, said on Friday.

Lawrence Summers, a former World Bank official and economic adviser under former Democratic president Barack Obama, said it was rare for government heads to leave during major summits and that, when they must, foreign ministers or other very senior government officials normally fill in.

“There is no precedent for a head of government’s adult child taking a seat,” he wrote in the Washington Post on Sunday.

“There is no precedent for good reason. It was insulting to the others present and sent a signal of disempowerment regarding senior government officials.”

Trump, defending the move on Twitter, claimed news agencies would be saying something different, were it Chelsea Clinton and her mother Hillary Clinton.

Chelsea quoted the tweet, telling Trump that it would never have occurred to her parents to do that.